Thesis Type: Postgraduate
Institution Of The Thesis: Canakkale Onsekiz Mart University, Lisansüstü Eğitim Enstitüsü, Food Engineering, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: Hatice Aşık
Supervisor: Muhammed YüceerAbstract:
Nowadays, the use of the shell egg as a raw material in the food industry is limited. And processing of eggs causes loss of functional properties of egg whites. In egg products, the decrease in functional properties caused by yolk contamination, pasteurization or storage recovered by developing enzyme technology.
In this thesis; the effects of lipase enzyme treatment by different concentration on the quality criteria of liquid egg white (dry matter, relative whipping capacity, foam stability, pH, rheological behavior, and color values) was investigated. Besides, the study evaluated the texture profile analyses, water activity, color of meringues produced by lipase enzyme-treated liquid egg white. Enzyme application didn’t affect egg white dry matter values. At 0,03% concentration during storage, stabilization of L* and b* values were achieved. When looking at the gas concentrations of liquid egg whites, it observed that O2 values decreased with storage and CO2 values increased as expected. While egg white foam capacity was found 613,33% in the control group, this value reached 766,66% in 0,03% concentration. While the dough density in the control group was 0,5055 g/cm3, it was decreased at the 0,03% enzyme concentration to 0,33266 g/cm3 as expected. According to results of color analysis, an increase in brightness values was observed.
Sensory analysis of meringues showed that the lowest scores obtained by the control group, and the enzyme treatment groups were acceptable. As a result, lipase enzyme was found to improve the quality of liquid egg white and meringues and showed its usability in industry.
Keywords: Egg, Liquid Egg White, Lipase Enzyme, Meringue, Functional Properties, Rheological Behavior.